On Tue, Feb 25, 2003 at 09:58:31AM -0000, peter.holmes@fopet-esl.com wrote:
> I have written a bespoke ioctl() to communicate with a laboratory testing
> device (length of wool fibres). It only partly works because, I think, the
> kernel parallel port driver/module is clobbering it:
> If I toggle the input _ACK line low, without my code running on LINUX, the
> _STROBE output toggles with it. Not quite in sync, there's a ca. 5uS delay.
That sounds like there might be something trying to talk to a printer
on that port. Something in the printer queue?
Incidentally, you might want to take a look at libieee1284 for
communicating with your device. It'll save having to recompile the
kernel and reboot each time you find a mistake in your code.
Tim.
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